Subaru 2002 IMPREZA Service Manual page 1434

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
6 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from throttle posi-
tion sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between throttle posi-
tion sensor connector and engine ground.
Connector & terminal
(E54) No. 1 (+) — Engine ground ( − − − − ):
7 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness between
ECM connector and throttle position sensor
connector.
Connector & terminal
(B135) No. 23 — (E54) No. 3:
8 CHECK HARNESS BETWEEN ECM AND
THROTTLE POSITION SENSOR CONNEC-
TOR.
Measure the resistance of harness between
tumble generator valve position sensor con-
nector and engine ground.
Connector & terminal
(E54) No. 3 — Engine ground:
9 CHECK POOR CONTACT.
Check poor contact in tumble generator valve
position sensor connector.
Check
Is the voltage more than 4.5 V? Go to step 7.
Is the resistance less than 1
Ω?
Is the resistance less than 10
Ω?
Is there poor contact in tumble
generator valve position sen-
sor connector?
EN(TURBO)-274
Yes
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
tumble generator
valve position sen-
sor and ECM con-
nector
• Poor contact in
throttle position
sensor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
• Poor contact in
joint connector
Go to step 8. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
tumble generator
valve position sen-
sor and ECM con-
nector
• Poor contact in
ECM connector
• Poor contact in
tumble generator
valve position sen-
sor connector
• Poor contact in
coupling connector
Repair the ground Go to step 9.
short circuit in har-
ness between
tumble generator
valve position sen-
sor and ECM con-
nector.
Repair the poor Replace the tum-
contact in tumble ble generator
generator valve valve assembly.
position sensor <Ref. to
connector. FU(TURBO)-41,
Tumble Generator
Valve Assembly.>
No